This stormwater filter vault has a lot of sediment buildup, indicating that the filter needs to be replaced by professionals.

MAINTENANCE

Underground

Catch basin, drywell, manhole, and vaults

Maintenance is needed if you see these signs
• The facility drains slowly after a rain storm.
• Leaves, trash and other debris slow or stop outflow or filtration.
• There is more than ¼ - ½ inch of sediment on the cartridges.

Confined space warning for underground facilities
Due to potential dangers, only trained and certified persons should enter confined spaces. These are defined as:
• Large enough that an individual could fully enter the space and work.
• Having limited or restricted entry or exit.
• Not primarily designed for human occupancy.
For more information visit Washington State Labor & Industries confined spaces rule.